Evaluation of convolutional-code-based FEC under limited recovery time and its application to real-time transmission

In this paper we evaluate the effectiveness of using convolutional codes under a time limit for recovery as a method for packet loss recovery. We analyze the method´s operation when a limitation on the number of received packets is substituted for the time limitation, and derive the probability for a lost packet being recovered before the arrival of the limiting number of succeeding packets. We also evaluate this probability in the results of simulation and estimate the buffer size required for a decoder. Moreover we apply this method in constructing a dependable videoconference system and observe the resulting improvement in QoS.